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[Eric Harney <1788619@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

If using multiattach, the "writeback" and "unsafe" disk_cachemode
options presumably break the semantics that an application writing to a
clustered datastore would rely on for data consistency between multiple
nodes.

Volumes should not be allowed to attach to multiple instances
(multiattach) with unsafe cache modes.

(This may even include writethrough?  I'm not sure.)

** Affects: cinder
     Importance: Undecided
         Status: New

** Affects: nova
     Importance: Undecided
         Status: New

** Also affects: cinder
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1788619

Title:
  disk cachemodes should be restricted with multiattached volumes

Status in Cinder:
  New
Status in OpenStack Compute (nova):
  New

Bug description:
  If using multiattach, the "writeback" and "unsafe" disk_cachemode
  options presumably break the semantics that an application writing to
  a clustered datastore would rely on for data consistency between
  multiple nodes.

  Volumes should not be allowed to attach to multiple instances
  (multiattach) with unsafe cache modes.

  (This may even include writethrough?  I'm not sure.)

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